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NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

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Q.1. The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.    (2021)
A: Current in n-type > current in p-type.
B: No current will flow in p-type, current will only flow in n-type.
C: Current in n-type = current in p-type.
D: Current in p-type > current in n-type.

Ans: A
Solution: 
In N type semiconductor majority charge carries are e- and P type semiconductor majority charge carries are holes.
I = neAVd = neA(μE)
μe > μh 
⇒ Ie > Ih

Q.2. Consider the following statements (A) and (B) and identify the correct answer.
A. A zener diode is connected in reverse bias when used as a voltage regulator.
B. The potential barrier of p-n junction lies between 0.2 V to 0.3 V.
    (2021)
A: (A) is correct and (B) is incorrect.
B: (A) is incorrect and (B) is correct.
C: (A) and (B) both are correct.
D: (A) and (B) both are incorrect.

Ans: A
Solution:
(A) is correct and (B) is incorrect.

Q.3. For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y?    (2021)
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
B: NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
C:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
D: NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Ans: C
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
(i) 0 to t1 A = 0, B = 0, C = 1
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET 
= 1
(ii) t1 to t2 A = 1, B = 0, C = 1
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
(iii) t2 to t3 A = 0, B = 1, C = 0
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.4. For transistor action, which of the following statements is correct?    (2020)
A: Both emitter junction as well as the collector junction are forward biased.
B: The base region must be very thin and lightly doped. 

C: Base, emitter and collector regions should have same doping concentrations.
D: Base, emitter and collector regions should have same size.

Ans: B
Solution:
For a transistor action, the base junction must be lightly doped so that the base region is very thin.

Q.5. For the logic circuit shown, the truth table is :     (2020)
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A:
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
B:
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
C:
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
D:
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Ans: C
Solution:
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
= A.B (using de-Morgan’s rule)
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.6. The increase in the width of the depletion region in a p-n junction diode is due to:     (2020)
A:  both forward bias and reverse bias
B: increase in forward current
C: forward bias only 

D: reverse bias only
Ans:
D
Solution:
The increase in the width of the depletion region in a p-n junction diode is due to reverse bias only.

Q.7. A resistance wire connected in the left gap of a metre bridge balances a 10 W resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1Ω of the resistance wire is:     (2020)
A: 1.5 × 10-1

B: 1.5 × 10-2 m
C: 1.0 × 10-2 m
D: 1.0 × 10-1 m
Ans: 
D
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.8. The correct Boolean operation represented by the circuit diagram drawn is:    (2019)

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A: AND
B: OR
C: NAND
D: NOR
Ans: 
C
Solution:

From the given logic circuit LED will glow,
when voltage across LED is high.

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Truth Table

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
This is out put of NAND gate.

Q.9. For a p-type semiconductor, which of the following statements is true ?    (2019)
A: Electrons are the majority carriers and trivalent atoms are the dopants.
B: Holes are the majority carriers and trivalent atoms are the dopants.
C: Holes are the majority carriers and pentavalent atoms are the dopants.
D: Electrons are the majority carriers and pentavalent atoms are the dopants.
Ans: 
B
Solution:

In p-type semiconductor, an intrinsic semiconductor is doped with trivalent impurities, that creates deficiencies of valence electrons called holes which are majority charge carriers.

Q.10. In the combination of the following gates the output Y can be written in terms of inputs A and B as :-    (2018)
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
B:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
C:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
D:NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Ans: B
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.11. In a p-n junction diode, change in temperature due to heating :-
A: affects only reverse resistance
B: affects only forward resistance
C: does not affect resistance of p-n junction
D: affects the overall V - I charaterstics of pn junction
Ans: 
D
Solution:

Affects the overall V - I characteristic of p-n junction.
On heating, a number of electron - hole pairs increase, so overall resistance of diode will change.
Hence, forward biasing and reversed biasing both are changed.

Q.12. In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2 kΩ, the voltage and power gain of the amplifier is :-    (2017)
A: 15 and 200
B: 150 and 15000
C: 20 and 2000
D: 200 and 1000
Ans: 
B
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET


Q.13. The given electrical network is equivalent to:    (2017)

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A: OR gate
B: NOR gate
C: NOT gate
D: AND gate
Ans: 
B
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.14. Which one of the following represents forward bias diode ?     (2017)
A:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
B:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
C:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
D:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Ans: 
D
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.15. To get output 1 for the following circuit, the correct choice for the input is :    (2016)
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A: A = 1, B = 0, C = 1
B: A = 0, B =1, C = 0
C: A = 1, B = 0, C = 0
D: A = 1, B = 1, C = 0
Ans: 
A
Solution:

The resultant boolean expression of the above logic circuit is given by,
Y = (A+B).C
Using the inputs given in the options,
If A = 0, B = 0,C = 0, we have
Y = (0+0).0
i.e., Y = 0
If A = 1, B = 1, C = 0, then we have
Y = (1+1).0
i.e., Y = 1.0 = 0
If A = 1, B = 0, C = 1, then
Y = (1+0).1
i.e., Y = 1.1 = 1
If A = 0, B = 1, C = 0, then
Y = (0+1).0
i.e., Y = 1.0
Y = 0
Therefore, output Y = 1 only when inputs A = 1, B = 0 and C = 1.

Q.16. Consider the junction diode as ideal. The value of current flowing through AB is :    (2016)

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A: 10-3 A
B: 0 A
C: 10-2 A
D: 10-1 A
Ans: 
C
Solution:
For diode as ideal
I = ΔV/R = 4-(-6)/ 103 = 10-2 A

Q.17. A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 Ω is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192Ω , the voltage gain and the power gain of the amplifier will respectively be :    (2016)
A: 4, 3.69
B: 4, 3.84
C: 3.69, 3.84
D: 4, 4
Ans: 
B
Solution:

Given,
Resistance across load, RL = 800 ohm
Voltage drop across load, VL = 0.8 V
Input resistance of the circuit, Ri = 192 ohm
Collector current is given by,
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET

Q.18. If in a p-n junction, a square input signal of 10 V is applied, as shown,

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
then the output across RL will be :     (2015)
A:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
B:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
C:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
D:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Ans:
A
Solution: 
As it is forward biased so it takes positive value. Hence, option (A) is correct.

Q.19. Which logic gate is represented by the following combination of logic gates ?    (2015)

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
A: NOR
B: OR
C: NAND
D: AND
Ans: D
Solution:

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Truth table
NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
This correspond to AND gate

Q.20. The given graph represents V−I characteristic for a semiconductor device.

NEET Previous Year Questions (2014-21): Semiconductor Electronics Notes | Study Physics Class 12 - NEET
Which of the following statement is correct ?    (2014)
A: It is for a photodiode and points A and B represent open circuit voltage and current,
respectively
B: It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively
C: It is V−I characteristic for solar cell where, point A represents open circuit voltage and
point B short circuit current
D: It is for a solar cell and points A and B represent open circuit voltage and current,
respectively
Ans: 
C

Q.21. The barrier potential of a p-n junction depends on:    (2014)
(a) type of semi conductor material
(b) amount of doping
(c) temperature
Which one of the following is correct?
A: (b) and (c) only
B: (a),(b) and (c)
C: (a) and (b) only
D: (b) only

Ans: B
Solution:
Barrier potential depends on the material used to make p-n junction diode (whether it is Si or Ge).
It should also depend on the amount of doping due to which the number of majority charge carriers will change. Also, it depends on temperature due to which the number of minority carriers will change.
Barrier potential depends on the material used to make p-n junction diode (whether it is Si or Ge).
It should also depend on the amount of doping due to which the number of majority charge carriers will change. Also, it depends on temperature due to which the number of minority carriers will change.

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